Nozzle grinding machine



NOZZLE GRINDING MACHINE Filed Feb. 25, 1947 8 Shee'ts-Sheet 1 ID a b= 0 SE @113 r a:

s I Q Q 3519; F m 1mm fwd 1, W02 Jam/d AZ @1/ June 27, 1950 M. H. ARMS ETAL NOZZLE GRINDING MACHINE 8 SheetsSheet 2 Filed Feb. 25, 1947 & if 722 /2 iii/w 02 4 W r w v g. I Jam N 2 mm ,2. s

I I f June 27, 1950 M. H. ARMS ETAL NOZZLE GRINDING MACHINE 8 Sheets-Sheet 5 Filed Feb. 25, 1947 gg/ J June 27, 1950 M. H. ARMS ETAL NOZZLE GRINDING MACHINE 8 Sheets-Sheet 4 Filed Feb. 25, 1947 N \WA 2% fwd 1/2 72240 mZd/Zf June 27, 1950 M. H. ARMS ETAL 2,513,223

NOZZLE GRINDING MACHINE Filed Feb. 25, 1947 s Sheets-Sheet 5 x Q P I I I I l O N l N I i s E: N, s R

rU j, 111:

June 27, 1950 M. H. ARMS ETAL NOZZLE GRINDING MACHINE 8 Snets-Sheet 6 Filed Feb. 25, 1947 u M J m J ffl Qw W m M @M a \\N W %w W\\\ @N June 27, 1950 M. H. ARMS EIAL NOZZLE GRINDING MACHINE 8 Sheets-Sheet 7 Filed Feb. 25, 1947 wlfi KM, AM.

June 27, 1950 M. H. ARMS ETAL 2,513,228

NOZZLE GRINDING MACHINE Filed Feb. 25, 1947 8 Sheets-Sheet s Emm 2 3 g i i Patented June 27, 195

2,513,228 7 NOZZLE GRINDING MACHINE Merton H. Arms, Paul A. Grobey, and Harold M.

assignors to Bryant Chucking Grinder Company, Springfield, Vt., a corporation of Vermont Application February 25, 1947, Serial No. 730,686

11 Claims. 1

This invention relates to internal grinding machines and has for an object to provide such a machine capable of grindin the bore of a nozzle having a cylindrical bore for a portion of its length communicating with one or more tapered bores, one of the tapered bores leading to a discharge orifice, the machine being capable of grinding the cylindrical and tapered bores with a single grinding wheel having cylindrical and tapered grinding faces.

A further object of the invention is to provide such a machine capable of grinding a tapered bore leading to an orifice of very small diameter.

A further object is to provide such a machine wherein a pair of tapered bore portions are ground by different portions of the tapered face of the grinding wheel.

Further objects and advantages will appear from a description of an embodiment of the invention shown in the accompanying drawings, in which Figure 1 is a front elevation of a grinding machine embodying the invention.

Figure 2 is a top plan view of the same.

Figure 3 is a longitudinal central sectional View of a nozzle showing the grinding wheel operating upon the cylindrical bore and showing the traverse limits.

Figures 4, 5 and 6 are views similar to a portion of Figure 3, but showing different relative positions of the work and grindin wheel during different stages of the grinding operation.

Figure 7 is a sectional view on line 1-1 of Figure 1.

Figure 8 is a, sectional view on line 88 of Figure 2.

Figures 9, 10 and 11 are sectional views on the correspondingly numbered section lines of Figure 8.

Figure 12 is a view similar to a portion of Figure 2, but to a larger scale and showing the wheel head.

Figure 13 is a sectional view on line l3l3 of Figure 12.

Figure 14 is a fragmentary view similar to a portion of Figure 13, but to a larger scale and in further section.

Figure 15 is a detail sectional view on line 5-15 of Figure 13.

Figure 16 is a right hand end elevation of the machine.

Figure 17 is a fragmentary View partly in elevation, and partly broken away and in section, of the facing stop adjusting mechanism.

Figure 18 is a detail sectional view of the fac- 2 ing stop mechanism on the workand wheel heads on line I8-I8 of Figure 17.

Figure 19 is a fragmentary sectional view similar to a portion of Figure 3, but showing a modified form of nozzle and the grinding of a second taper surface therein.

Figure 20 is a, fragmentary top plan view similar to a portion of Figure 12, but showing" a modification particularly suitable for grinding a nozzle of the form partly shown in Figure 19.

Figures 21 and 22 are detail sectional views'on lines 2 I-2l and 2222, respectively, of Figure 20.

The drawings illustrate an internal grinding machine of the general typeshown in the Arms Patent No. 2,310,338, granted February 9, 1943, for Metal Working Machines, but involving certain changes particularly adapting the machine for grinding the cylindrical and tapered bores of a nozzle such as is used in connection with the fuel injection system of Diesel engines:

The machine comprises a bed I carrying thereon at one end, a work carriage 2 mounted for motion from front to back of the machine, this front and back motion being employed to feed and retract the work relative to the grinding wheel when grinding the cylindrical hole in the work. The mounting of this carriage may be the same as that shown in the Arms Patent No.

2,310,338, to which reference has previously been made, and shown herein is a wheel 3 on the for.-

ward face of the carriage 2 and fixed to a feed shaft 4, by the rotation of which this motion of the work carriage is produced as fully disclosed in that Arms patent.

Work support Within the work carriage is journaled a workcarrying spindle 5, but this spindle is mounted in a different manner from the disclosure in the Arms patent in order to provide for axial motion of the spindle relative to the work carriage. This axial motion is for the purpose of feeding the work axially toward the wheel when the taper bore portions of the nozzle are being ground, as will later more fully appear. The spindle 5, as shown face of the pulley. This pulley may carry a suitamazes able driving belt (not shown) by which the spindle may be rotated from a motor I4 (Figure 2) carried by the work carriage 2. Outwardly of the pulley ID the spindle 5 is journaled in radial thrust angular contactball bearings arranged back to bachand'loaded by tighteningihe nut.

l8. The outer raceways l6 of these ball bearings [5 are carried by a collar l'l'.

axial relation thereto within the collar llwhich' is held against rotation as will later appear.

The spindle 5 is hollow and carries axially' movable therein, a rod 20, the forward end of which is connected to a work-clamping collet 22 having removable jaw clamping pads'23 at its forward end for engagement with the outer face of a work piece consisting of. the nozzle'to 'be ground and as shown in Figures 3 or 19. The

outer: facesof. thevcolletu-jams;.such. jaws ubeing shown at its forward end,.are :formed with inclined faces. 24! with. which cooperate mating faces; on: a'lringl25 carried .by a face plateiii' which: is: secured. to 1 the forwards end .of the spindle. The face plate actsasa countenba'le ancetfor: this. end; of the spindle. for. the weight ofpartslat the other end. Theuspindlealso carries: ailimiti stop-31L to limit the :extent to which. theizwork pieces may be inserted 1 between theipads'23 .v This stop. 30 at. its:-.rear= end is threaded. into. at spider 3l which: extends ra-- diallyi outwardly. between the jawscof thecollet, aszshowmbestiinFigure 10, the.;outer ends of thespider: arms-being clamped against an -an nular shoulder: 33" within the spindle 5:- as-bytaper. ended: screws 3d threaded transversely through. thelspindle 5, their conical; ends en gagingtapered \faces-35 of-the spider arms. The face platelfi may be provided:withholes .36

linewiththescrews- 34 so that access may be had to--thesescreWs from-the exterior of the faceplate.- A dust g-uard element-38" is at tached to the innerfiface 1 of the bearing su pport 40 and-has a neck portion': 4i projecting insideofith'e rear: face of and close .to the face plate 26 and relative to-whichthe face plate may be -moved axially with --the== axial motion of thezspindle-ii The rear: end of the rod 1 28: is provided with a head 45' against the forward face of which bears" a spring fi seated in: a-recess 4''! in the outer end of the: spindle, this spring tendin-g" to a hold the rod retracted With-theflZOllfi-ZPil'i work-clamping position. It. may, however, be forced forwardly to release the collet by engagementof a piston abutment-=50 against the rear end of the rod-' 20, the-piston being slidable in a fluid" pressure cyli nder 5-2 to which fluid-under pressure may beadmitted or discharged through;

springs' or reeds 61 secured-at their rear ends to:a*frame portion 68 o'f-th'e work carriage, this portion forming a housing for the-rear end-of the spindle. A third leaf spring or reed I0 is anchoredat one end tothe rear" upright wall" of" tlielever 6'6; and at its forward end' toa bracket portion 12 of the work carriage, as

The spindle;v 5 thus rotates without backlash and thus in fixed.

shown best in Figure '7. This provides a pivotal mounting of the rear end of the lever 65 formed by the reeds 6i and 10 which is free from lost motion, and by swinging this lever 66 on its reed .fulcrum it will be apparentthat the spindle 5 may be moved-axially; The lowerlug 6| is slidably guided in a slot 73 in the housing 68, thus holding the collar H against rotation. The limits of axial motion of the spindle 5 may be determined by a pair of adjustable stop screws l5:(see.:Figure.7).between which the lever 66 extends and-carried by lugs '56 on the forward faceof-the casing-'68 which houses the rear end of the spindle,- thelever 86 as shown having hardenedheaded' abut-merits l8 in position to contact with the stop screws 15.

The'angular position of the lever 66 may be varied as desired, and micrometric means may be .providedfor. swinginglit to -move the spindle axially to. bring. the: work against the grinding wheel for grinding thetapered portions of 1 the bore as will later appear; This micrometric adjusting meanscisshown best inFi'gure 7, and comprises a i bar. L slidable through a :bearing bracket 8.] and having its forward portionex ternallythreaded. as 4 at 82;] Cooperating with these threads are matingdnternahthreads on a sleeve 83 journaled in the bracket fi i .1 and held against axial motionby-amannular head' 34 at one end, and a.wheela85zattheotherl'end, bearing against opposite-facesi of the: bracket BI, and held in position by. a..nut 363 threaded-on. the forward end of; the sleeve 83,.andheld inmosition asby a1set screw 3'1.v Thisiwheel 85 is provided with a handle 88 by: which it. may be.

turned and is also: provided with-.a. graduated peripheral portion at.'39 with. which cooperates.

an index element-,89Bycarried bythe bracket 81;

The rear or outer end of the bar 80 is'zpro-- vided with a flattenedip'ortionextending-into a guide element 810.; (Figure; 1). andxacross this portion is adjustablyslidable the; inner. end of a flexible strip 9ii-,,the:rear.'endlofwhich issuitably secured to'the outer: end portion of: the lever 65, as by a-clampin-g cap 9| securedzlby. a screw 92. This strip 90 may becadjustably secured at either endrportion to' itsadjacent part,

either thelever 6B orrthe-bar'BO': In Figure; 2' itis shown as-adjustably clamped/t0 the lever 66,

a screw knob 9; whiohtmay act as=a-clamp and also as a handle which :may-beg-rasped by the operator, bein employed to clamp the stripgSlL in position. In Figure 7; this'adjustmentzis between the strip 911 and the bar 80, the strip being provided with a slot 91 through which extends-a screw 98.'provided.witha clamping thumb nut 99. If the strip 90 is fixedly held to the leverv 6B,.the'. outer end of. thisllever. is preferably provided with a knob I00 by. which it may be grasped by the operator for a purpose which will later appear.

From this construction it will be seen thatlthe lever 66 may be adjusted by hand to. the desired point, allowing. the strip 90 to slide relative to one or the other of its end adjustments andthen Grin-ding wheel: mounting:

The grinding wheel slide H0 may be mounted This is; for a purpose which. will on the machine for motion from and toward the? work carriage in the manner shown in the Arms Patent No. 2,310,338, but for the purpose of this invention the grinding wheel spindle is not directly carried by this wheel slide. Instead the wheel spindle III is journaled for rotation in a.

carriage I I2 which is mounted for motion on the wheel slide IIO but at an angle'to the direction of motion of this slide, this angle corresponding to the taper of the taper bore portion of the work piece. This mounting is illustrated best in Figures 12 to 15. The wheelslide IIO has-a pair of upwardly extending portions I I4 which have clamped therein a pair of spaced guide bars II5 (see Figures 12, 13 and The carriage II2, which carries a wheel head II6 carrying .7 the wheel spindle III, has forward and rear walls H8 and H9 which extend down on opposite sides of the upstanding portions I I4 of the wheelslide and these Walls H8 and II!) are provided with bushings I which are mounted on end portions of the guide bars 5 which extend beyond opposite faces of the portions II4, as on preloaded ball bearings I2I and I22. The forward ball bearing I2I is covered over by aocap I 23,

which houses the outer end of a plunger I24 slidable in the outer end of a socket I25. in the adjacent end of the guide bar H5 and pressed outwardly by a spring I26 seated in the socket I25.

This plunger I24 acting on the cap I23, presses.

the caps II6 of the wheel carriage forwardly along the inclined guide bars II5 as far as is permitted by the engagement of a cam contoured rod I28 journaled in the portion II9 of the wheel carriage, the cam face of which bears against a rod I20 mounted for axial motion in one of the portions II4, its inner end bearing on a face I30 of a second cam bar I3I also journaled in the portion II4. This cam bar I3I also has a face I32 which bears against a plug I33 mounted in a bore I34 of the portion H4 and backed up by an adjusting screw I35. This plu I33 determines one angular limit of motion of the cam bar I3I and this limit of motiondetermines also the forward limit of motion of the rod I29. The cam bar I3I is provided with an actuating handle I at its forward end, while the cam bar I28 has a similar actuating handle I4I at its forward end. This latter handle I4I may be turned toward and from a limiting position determined by engagement of a pin I42 thereon with a fixed stop pin I43. The portion of this cam bar which bears on the rod I29 is so shaped that as the handle MI is turned between its positions, they wheel carriage is moved axially for a short distance sufficient to bring a cam follower I58, to be later described, into or out of operative relation to a cam by the motion of which automatic traverse of the carriage along theinclined bars II5 may be produced. The angular motion of the handle I40 may act to give a further extent of motion of the wheel carriage back of its automatic reciprocation and independent of that produced by rocking of the handle I4I, this being sufficient to move the wheel carriage in a path during which the tapered face of the wheel may be trued, as will later appear.

The reciprocating means for the carriage is shown best in Figures 12, 13 and 14. The rear end of the wheel carriage has secured thereto, as by screws I50, a yoke member I5I having a pair of side jaw portions I52 which have between them a cam in the form of an eccentric I53 carried by the upper end of a shaft I54. This eccentric I53 carries the inner racewayv I55 of a ball bearing I56, the outer raceway I51 of which. is stationary as the eccentric revolves, and when the handles I4I and I40 are in their loweredposition shown in Figure 12, the cam fol- 1 lowerconsisting of an abutment I58 micrometrically adjustable through a cross bar I59 fixed to. the rear ends of the jaws I52 engages on thisv outer raceway.r- As. the eccentric I53 is rotated, the'abutment I58 follows the motion of the outer rraceway in the direction of traverse permitted by. the guide bars II5, the springs I26 holding the abutment.tl58 against the raceway member I5I-. n Thus by rotation of the eccentric, a reciprocatory motion of the wheel carriage in a direction angular to the direction of motion of the wheel slide takes place, this being through a small amplitude but sufiicient to provide the desired traversing of the tapered face of the grinding wheel along thetapered face of the work piece. "Rotation of the eccentric I53 is produced by rotating the shaft I54 in its ball bearings I50, and to this end the shaft I54 has fixed thereto av worm Wheel I5I (Figures 12 and 16) with which meshes a worm I52 fixed to a shaft I63 journaled in a casing I630 carried by the Wheel By turning thehandle I4I from its lowered position shown in Figure 12, the wheel carriage may be retracted along the guide bars II5 sufficiently to bring the abutment I58 out of contact with the eccentric ball bearing element so that no angular reciprocation of the wheel carriage with the wheel may be produced. The abutment I58, which was previously described as micrometrically mounted, may have the graduated micrometer thimble I59 by which its position of adjustment may be read, this being for a purpose which will later appear.

One form of work piece and the grinding wheel for performing the desired operations thereon is illustrated in Figures 3 to 6. The work piece, as shown in these figures, comprises a cylindrical body 200 having a rear end portion 20I of somewhat increased diameter and a central cylindrical bore202. At the forward end of this cylindrical portion it opens up into an enlarged cavity 203 from which a, tapered bore portion 204 extends to a nozzle aperture 205. The grinding wheelfor operating on these bores has a cylindrical portion 206 terminating in a tapered conical end 201. The cylindrical portion 206 is employed to grind the cylindrical portion 202 of the bore, and the conical portion 201 is employed to grind the conical surface 204. The cylindrical portion of the bore 202 is traversed during the grinding operation by the cylindrical portion 206 of the grinding wheel, this traverse being effected by the oscillation of the wheel slide, this oscillation being effected between the limits shown in full and dotted lines of Figure 3. This traverseing motion of the wheel slide may be effected by power means which may be identical with that shown in the Arms Patent No. 2,310,338, to which reference has previously been made. The means which determines the inner limit of such traversing motion, this being the full line position of Figure 3, is determined by the impingement of a control element 208 upon a stop dog 2I0 shown in Figures 1 and 18, but in order that the carriage may be moved an additional amount to bring the grinding wheel tapered end portion nearer .to the taper surface to be ground, this amazes;

7 stop dog :2 l is: mounted :sozthatzitzmayrbb lif-tdn by" then operator-out i: of 2 operative... position and: asw wshown; Figures 1 and: 18, this smayrbecacy-a complished: .by providing. a slot :2 l l :in: the dogs: stopllil'through which passes a fulcrumlpin'J-H'. 5 Likewise, in: order: totadvance v the grindingawheel-i from timestoxtime as the conicaloendtportion ofi the grinding wheelis wornorttrued off; andcto: make: sure that. the traverse extends. inufar: enough i for: the: cylindrical J portion 206 of? the 1 wheel to clear the :inner end ofthexcylindr icalu bore, the stop. dog: 2"]. may be. adjustedtmthe; right, .as ;showncin s Figure 18; by:means: of an: adjusting screw 2 l 3': During 7 this grinding, 0p-- eration of-. the cylindrical bore 202;.the:wheel carriage is held retracted with the: abutment I 58 rout iofwoperative relation to the eccentric I53 soethat the entire motion. otthe: grinding wheel islengthwis'eof the spindlesaxisi When the desired extent of grindingwoflthe cylindricali portion 1202 has been completed and: theewheeluslidei hasi beens retracted, as by themechanismifully. described in. the. Arms Patent N 2,310,-338,;the..parts:are then adjusted for the grinding. ofthe taper bore portion 204; The. wheelslide 'isthen moved forward (to the left in- Figures ll and 2 until it is stopped by impingement: of a facing- .stop' element 'r 'llI- carr-ied by the wheel slide against a cooperatingstopZZ-l adjustably carried by thebed of the machine (Figure- 18). While these stops. 220 and 22 Har-e; not new with this-machine, beingsh'own in the Arms- Patent No. 2,310,338;to-which refrence has heretofore been made, they have been -illustratedherein as they are-used in--a particular 352: manner in thecycle of operations. The stop 220 maybe placed at adjustable distanceyfrom the forward face of thewheel slide;- and fen thispurpose-this stop may be'providedwith-aseries of stop rods 222 supportedat various angular" 0 positions about its axis'andof varying-length'sy anyone s ofwhich may be brought '-to -aposition in line with an abutment 223on' the wheel slidep the others of the series being placed opposite to openings 225 inthewheel slide-into which they may extend if they=are-ofsufii'cient-lengthbto' do so when -the-selected rod 222 is--inposition* tolbe stopped by the-abutment 223. E y-this means the amount of extension of th-e step 229 may I be adjustedfrom one-t0 another'-' off any selected of a number of difierent positions; each position being 1 definitely predetermined by the efiectivelength of therod 222 then inoperative position.-

The position of 1 the stop-- 22! is adjustable; and-for this purpose -it is shown as provided' witha threaded shank 230 with =wh-ich is -en-= gaged-a-nut 23l journaled in -acasing-' 232 'se cured to the bed of the-machines- This nut 23 l has -a-portion of its peripheryformedas a; worm 6m wheel-with which cooperatesa worm -2'33 on a shaft-234 which carries a hand wheel 235 at -its' outerend by which it may be turned;

Inthe position of the wheel' 'sl-id where th'e facing stops are in contact, theconicar portion: of the grindingwheel may-not be sufiicie'ntlyfar advanced-to contact with: the'boreofthe work piece: The workpiece then:may 'be -brought' up gently into contact with; this portion of 'th'e grinding wheel and this may be done -by releas ing thestrip 905 at its:releasable end and with the indications on: the wheel- 85 turned tonzero at the indication- 890,: and the outer: end 'offi'the lever-66 may then be movedLtoward the right until the operator-feels the work "contacting with the: conical end oftheegrinding wheel, whereupon; the; simp e- 90p clamped in position, and

the;.funtherrmotion;;of the workpiece toward the Wheel:-,:to-.=feed-:itagainst the wheel is effected 30513118; desired extent by'rotating the hand wheel untilithezdesired depth indication on the indicator. BBlhasbeen reached.

If:l'dSined,rthei'm0t01- lfi may. be set sufiiciently toytherright to bring its .abel't pulley to the right of. -the.pu1ley,--Ifl-so thau-theapull of the belt biases thework-spindle:axiallyto. gently bring the work towcontaet-ftne grindingwheel while the strip 98 is-releasedi- Gentle-contact-between the work and whee1-;is::impontant; to; avoid: breaking the wheel and: is-facilitatedyby, the flexible reeds and 'pre-- loadedlthrustbearin'gs at the plungers 124 which eliminates; errors: from backlash and running clearances?andpeliminates' frictional drag which would :reduce sensitivity; of control.

Durinsxtherfeeding of vthe work piece toward then'grindingswheel;the grinding Wheel is oscillat-ed: parallel to; the wheel taper by, releasing; the

wheel l carriagea fromdtsrearward, position by rockinglptheahandle IM; tothe left, the handle Hi0 beingzrlm its lowered position, allowing the abutment l5i8 toz'come into operative engagementwithv thee-eccentric; This-.beingr-rotated by its driving niotongthe'wheel is given a slight oscillation in thezleng-thwisel direction:v of the line of contact between .the taperaportionof the wheel and the workpiece. i

figures 4; 5. andz6aillustrate the various relationships between-the wheel and the work for the astartirof; the-taper. grinding operation. In Figure i ls-the relative position between the wheel andzltlreawork lpiece in shown where thewheel head-.hassb'eerr advanced against the facing. stop. Figuree5ils-howsthe 7 work. piece. advanced into contacwwith .the' iwheel'; while Figure 6 shows in dotteddines theitraverse limits of: the taper portioniof cthe :wheel with relation to the tapered face oi:the= work. iece during the grinding of thisztapered ifaoecth'e wheel then being oscillated inaza patlfriangularlyvrelated to its axis and in the.;i11clined::direction:.ofithe guides H5. When the igrinriinghh'as thus. proceeded to the desired extent;..the work piece is retracted fromthe' wheelby reversing th'elrotation of the'hand wheel fifigrthe wheelahead is retnrneditoi its retracted positioniout OfJdJZiVBIIIIBIEtiOII from the eccentric |53zbysreturningthe handle, M I to the retracted angular;positionnwithzthetpin i 32 engaging the stop :pinnl43 Figure 12, and the wheelslide is retractedaandmade readyfor a subsequent grinding zoperationai Inrsom'e casesthei'workyupiece may be provided with'iaiusecond tapered facefill; as shown in Figure 219;? atithe rear end: of the cylindrical bore- 20E,c.this2..taper::beingJon the same angle as the taperaportioni:Zlllfiadgiacent to the-nozzle orifice.

This-'face fifl may be also be ground by the taperigrindingwportion 291'. The Wheel may be positioned totakecareof this grinding operationbywausing the oscillatiomproduced by the cocentric I53 to -be impartedthereto while thewheel: is in a position further removed from its position relative to the workaxis than is its position: when grinding the. taper surface 2M adjacent to the-nozzle orifice. It also in a different axial position. This'may be accomplished by adjusting the: facing stop 229 to a different axial positiom as by the use of a stop rod= ZZZ ofigreater Iength than that utilized during the grinding :of th'e inner tapered surface 204.-

The further-separation of lthe wheel from the Work axis may be accomplished by the use of a removable stop 260 of the proper thickness which can be interposed between the eccentric I53 and the yoke end member I59, as shown in Figures 20 to 22. This member '260 may be pivoted On a pin 26| passing through a slot in one of the yoke arms |52a and may be provided with an actuating handle 262 by the manipulation of which it may be turned into the operative position inwardly of the yoke end member I59 shown in Figures 20 and 21, and in full lines in Figure 22, in which position, it acts to retract and hold the wheel retracted away from its normal axial position for cylindrical grinding into the position where it may engage the tapered face 250. The stop 200 may, however, be thrown out of operative position into the dotted line position of Figure 22, in which case the wheel carriage may move forward and, provided the handles I40 and MI are in position to permit it, till the micromentrically adjustable element I58 is in operative relation to the eccentric, in which position the wheel is in condition and position for operating on the tapered bore 204 adjacent to the nozzle.

It will be understood that that portion of the tapered wheel adjacent to the point of the taper is less effective for grinding than the portion further removed therefrom because of the higher rate of cutting speed of the individual grits the further they are removed from the axis of rotation, and that a grit at the extreme point or lying in the axis of the wheel in ineffective to out. It i therefore, important that when the tapered portion 204 adjacent to the orifice of the nozzle is being ground, the wheel be presented thereto as far back from the point as possible, but without the wheel contacting with the diametrically opposite part of the surface. Referring, for example, to Figure 6, the contact between the wheel and the work is desired at one side.

of the axis of the wheel, but not on the other. Consequently the relative adjustments of the wheel and work'for grinding this tapered portion must be quite precise and the amount of oscillation of the wheel small in order that the grinding contact may be held as far as possible away from the wheel axis. Where the nozzle to be ground is of small diameter having a nozzle aperture of as small as .04" diameter, the adjustments must be made very accurately in order to maintain this desired relationship, and often the outer portion of the taper part of the wheel cannot be brought into grinding relation to the work at this taper surface because of the limitations afforded by contact with the opposite face of the work from where contact is desired. Since this larger diameter portion, however, is more advantageous for grinding than is the small diameter portion, it may be made use of when the nozzle is provided with a rear taper face such as l 250 in Figure 19, and the parts should be so proportioned that this larger diameter portion of the tapered face is in operation for this portion of the grinding.

Means for truing the wheel, both for the cylindrical and tapered portions may be provided, to this end a truing device being shown at 2'!!! in Figure 2, this being supported on the inner face of the work slide and being rockable forwardly and backwardly into and out of proper position with respect to the cylindrical surface of the wheel when the wheel is moved by motion of the wheel slide, and in proper relation to the taper portion of the wheel when the wheel is moved by motion of the wheel carriage.

10 The various operations performed by the apparatus as thus described may be accomplished as follows.

Setting up The machine is set up with the dressing diamond set to the diameter of the cylindrical part of the hole ground and to finish size.

One position of the turret facing stop on the wheel slide is set so that the tapered portion of the wheel will be in position to be dressed by the diamond when the wheel carriage is oscillated.

A second position of the same turret stop is set to a known length longer than the first, which increase is equal to that axial distance between the diamond and the cone of the seat of the work to be ground. This is an approximate adjustment, since the work spindle is adjustable longitudinally.

The eccentric driving the wheel carriage traverse motion is adjusted to traverse the carriage only the small amount necessary to break up grinding marks, say, .010" stroke.

The micrometer thimble I69 is adjusted so that the axis of the wheel is only a small amount, say, .002" in back of the work axis when the work feed is at a setting for the finish size of the cylindrical hole and the stop [58 is contacting the low point of the eccentric, that is, with the wheel carriage at the left hand limit of its stroke.

Operation 1. The cylindrical portion of the wheel is dressed in the conventional manner with the lever I 4! in position to hold the carriage away from the eccentric, and the stock is removed from the wheel by feedingthe work slide toward the front.

2. After the cylindrical portion of the wheel has been dressed, as noted in the preceding paragraph, the wheel slide is moved to the left until the facing stop 220 set in dress position by the selection of the proper element 222 engages the stop 22!. The wheel is then caused to traverse the dressing tool by hand operation of the lever I40, the lever l4l being retained in its position in which it was put for the cylindrical wheel dressing. The stock is removed from the wheel at the taper portion by retracting the feed screw hand wheel for the facing stop 22l, permitting the wheel slide to move toward the left. The amount of turning of this hand wheel during the dressing operation is noted and the adjusting screw 2l3 for the right hand reversing dog is adjusted to the same amount. This compensates in the inner limit of stroke of the wheel while it is grinding the cylindrical portion of the bore, for wear and truing on the taper portion of the wheel.

3. The turret facing stop 220 is then turned to taper grinding position with the proper element 220 in operative position, but the position of the opposite facing stop 22! is allowed to remain as it was after the dressing adjustment.

4. The work slide is then backed off by actuation of its cross feed mechanism.

5. The cylindrical portion of the hole in the work piece is then ground in the usual manner with the automatic traverse and with the lever Ml of the wheel carriage still in the same angular position to operatively disengage the carriage from the cam so that it has no angular motion. The cylindrical portion of the hole in the work is then ground to finish size.

6. The right hand lever MI is then turned 1 1 downto -engage the w'heel carriage-with the eccentricfor the angulartraverse, and if the thimble I69 has been adjusted as previously directed, the axis of the Wheelwill be about .002" back of .thework axis atthe left hand end ofthey angu- :lar stroke. Rotation ofrthis'eccentrionow-produces the reciprocation of the wheelcarriage parallel to the grinding wheel taper.

:7. iT-he main wheel .zslideis'then-moved forward with=the 'facingstop ;22iJ adjusted'for the taper :seat grinding in the sameposition-at'which it was positioned for the truing of the tapered face.

18. :A'ssumingrthatthework is now positioned in theechuck that'the'tapered seat is uniform inrelation .to the work spindle, it 'is not/necessary'to releasewthe work spindle thrust lever from-its micrometric feeding mechanism. However, 'if there is a wide variation or whenlarnew wheel .is put on, the strip 90 is disengaged-atone or the other of its "ends and the lever'.-66 is adjusted until the operator feelsthe contact between the wheel and the taper seat, after =Whichthe reed isreclamped, or provided therewis sufficient axial-thrust on the spindle through the beltconnection to its driving motor,. as previously-ade- "scribed; this will bringthe work axially into'the .properposition-for tightening the strip 90 to both -the lever andzthe micrometric-adjusting device.

9. The-work spindleislthen fed axially to -grind the taper seat by rotation through thedesired extent of the hand wheel '85. When this taper seat has been .ground to the .desired depth, .the reading on the feed.89 is then noted and the "micrometer thimble I69 on thewheel carriage is "adjusted to correspond. This setting of the thimble maintains predetermined :relative. spac- ,ing 'of'the wheel axis andthework axis. .The

wheel'slide can be withdrawn to the .rightaway ,fromthe facing stop at. anytime .for'inspection of '"the seat and'returned to ,grin'ding position "without changing the adjustments.

10. Assuming that there .is no taper'faceZSBto be ground at the outer end of the cylindrical hole I 292, the :wheel slide is then withdrawn, theoperation being complete, .the work pieces are changed, and the cycleis repeated. The work carriage cross feed slioul'dthenbe backed off. If, however, there isan'outer taper; as the taper 250 of Figure 19, to be ground, further steps arenecessary before removing the worker backing o'fi the cross feed as follows.

'11. Without changing the adjustmentof the cross feed on the work, the wheel slide iswithdrawn to the right and the work spindle is moved to the left.

12. The stop element 260, shown in Figures'20 to 22, is then inserted between the eccentric and the yoke end member I59, which can be done by swingingthe'lever I40 in a" direction to "withdraw the wheel carriage sufliciently.

1-3.."Ihe third position of the facing stop 220 for grinding the'outer'taper' is then engaged.

14. The outer taper '259 is 'then ground by feeding the'work spindle axially'to the right, the Wheel carriage thenbeing oscillated bythe action of the eccentric against the e1ement260.

15. On completion of the grinding .of this tapered surface, the-wheel slide is moved to the right to changethe -work preparatory to repeating the cycle 'of"operations,the work slide cross 'feedbeing backedofi' beforestarting operation on the next work piece.

From the foregoing-description of certain embodiments of'this invention;'it'should beevident "to T those skilled in 'the art" that various further modifications and .changes'may be made without -'departing'from its spirit or scope.

within which said cam'is positioned, means for rotating said shaft, means biasing said carriage to press one end of-said yoke against said cam whereby the rotation of said shaft causes reciprocation of said carriage, and an abutment carriedby said yoke andmovable into or out of position between said cam and said yoke tothereby change the effective relation between said carriage and'cam.

2. IlflCOIllblIlfltlOI'l, a work support, a rotary -work-carrying spindle journaled on said support .20

'spindleaxia'lly, a micrometer adjustment means connected to said lever for swinging said lever, a

'slid'able connection between said adjusting means and lever, an'd'means-for clamping said connectionagainst sliding.

'3. In combination, a work support, a rotary woik-carrying spindlejournaled on said support and movable axially relative thereto, a collar iournaled' on said spindle and axially fixed with relation thereto, a'lever mounted for swinging motion in a plane parallelto the axis of said spindle, a connection .from said lever to said collar whereby swinging of saidlever moves said spindle axial'ly,'a bar mounted for axial motion, a member having threaded connection with said bar 'for axial adjustment of said bar by rotation of said member, and a connection from said lever to said bar causing the axial motion of said bar to swing said'lever.

4. In combination, a work support, a rotary work-carrying spindle journaled on said support and movable axially relative thereto, a collar journaled on said spindle and axiallyfixed with relation thereto, a lever mounted for swinging motion in a plane parallel to the axis of said spindle, a connection from said lever to said collar whereby swinging of said lever moves said spindle axially, a bar mounted for axial motion, a member having threaded connection with said bar for axial adjustment of said bar by rotation'of said member, and a connection from said lever to said bar causing the axial motion of'said bar to swing said lever, said c'onnection'having a releasable engagement with one of the parts connected thereby.

5. In combination, a work support, a rotary work-carrying, spindle journaled on said support and movable axially relative thereto, a collar journaled on said spindle and axially fixed with relation thereto, a lever, aplurality of reeds fulcruming said lever on said support'for motion in a plane substantially parallel to the axis of said spindle, a reed securing said lever to said-collar whereby swinging of saidlever-moves said spindle axially, and means actuable to swing said lever.

'6."In combination, a work support, a rotary work-carrying spindle -journaled on said support and movable axially relative thereto, a collar journaled on said spindle inpre-loaded thrust anti friction bearings, a'lever, a plurality 13 reeds fulcruming said lever on said support for motion in a plane substantially parallel to the axis of said spindle, a reed securing said lever to said collar whereby swinging of said lever moves said spindle axially, and means actuable to swing said lever.

7. In combination, a wheel carriage, a grinding wheel on said carriage having a tapered face portion, a work holder, means for moving said wheel carriage parallel to one side of said tapered face to produce grinding of a tapered portion of the work on said work holder by said tapered face, means for feeding the work holder axially of said Wheel against said wheel for the grinding of said tapered face, means supporting said wheel carriage for adjustment axially of said wheel, and means for adjusting said wheel carrier axially relative to said axial feeding means to maintain said tapered face in predetermined relation to said axial feeding means regardless of wheel wear and truing 8. In combination, a wheel carriage, a grinding wheel on said carriage having a cylindrical and a tapered grinding face, a work holder, means for moving said carriage and work holder relatively parallel to the whee1 axis to eifect traverse between said cylindrical wheel face and a cylindrical face of work on said work holder, means for limiting such axia1 movement in one direction, means for relatively moving said carriage and work holder parallel to one side of said tapered face to grind a tapered face of the work, and means for adjusting said limit of said relative movement of said carriage and work holder parallel to said axis to compensate for shortening of said cylindrical wheel face by wear and truing of said tapered face.

9. In combination, a work support, a rotary work carrying spindle journaled on said support and movable axially relative thereto, a collar journaled on said spindle and axially fixed with relation thereto, a bar mounted for axial movement substantially parallel with said spindle, and a connection between said bar and collar causing the axial motion of said bar to move said spindle axially.

10. In combination, a work support, a rotary work carrying spindle journaled on said support and movable axially relative thereto, a collar journaled on said spindle and axially fixed with relation thereto, a bar mounted for axial movement substantially parallel with said spindle, and a connection between said bar and collar causing the axial motion of said bar to move said spindle axially, said connection being adjustable to thereby adjust the limits of axial motion of said spindle corresponding to a predetermined extent of axial motion of said bar.

11. In combination, a work support, a rotary work carrying spindle journaled on said support and movable axially relative thereto, a collar journaled on said spindle and axially fixed with relation thereto, a lever mounted for swinging motion in a plane parallel to said spindle and operatively connected to said collar, a bar mounted for axial movement substantially parallel with said spindle, a flexible rod carried by said bar and lying substantially parallel to said axis, and a clamp carried by said lever and adjustably fixed along said rod and causing the axia1 motion of said bar to move said spindle axially.

MERTON H. ARMS. PAUL A. GROBEY. HAROLD M. DAY.

REFERENCES CITED The following references are of record in the file of this patent:-

UNITED STATES PATENTS Number Name Date 95,342 Harper Sept. 28, 1869 1,530,242 Cumner et al Mar. 17, 1925 1,989,792 Drader Feb. 5, 1935 2,083,682 Balsiger et a1 June 15, 1937 2,139,896 Johnson Dec. 13, 1938 2,167,647 Gideon Aug. 1, 1939 2,210,273 Wildhaber Aug. 6, 1940 2,237,583 Birkigt Apr. 8, 1941 2,356,499 Beduneau Aug. 22, 1944 2,414,182 Wessman Jan. 14, 1947 FOREIGN PATENTS Number Country Date 664,897 France Sept. 11, 1929 

